Lock.



UNITED STATES HANS MOLLENHAUER,

PATENT OFFICE.

OF BERLIN, GERMANY.

LOGK.

SPEGIFIGA'ILION forniinlg part of Letters Patent N o. 674,315, dated May14, 1901.

Applioation filed J uly 2, 1900.

T0 aZZ whom 7323 may concern:

Be in known man; I, HANS MOLLENHAUER, ofZwinglichstrasse 22,Berlin,Germany, have invented certain new and useful Improvements inLochs; and I (10 hereby deelare the followin g 110 be aful1, elear, andexaet deseription 0f the invention, such as will enable 0thers skilledin the art 130 which it appertains 130 1 make and nse the same.

The present invention relates to improvements in locks and latches; andEhe object; of il; is 110 provide an improved deviceapplicable t0 anyloek er lateh already made er hereafber t0 be made and whieh deviceshall audibly announce the insertion and use er attempted use 0f a falsekey 01' pick 1;0 open the same.

Referring t0 the aeeompanying drawings, whieh are to be haken as part;of ohis specifieation and read therewith, Fignre l-is anelevation of theinside of adoor having a m01- tise-loek fitted wilah the improved safenydevice; Fig. 2, a similar view after parts of the door and Of Ehe insideside platze have been broken away, am]. Fig. 3 an elevataion of the web0f the proper key and of the improved safety device.

aisalock-bolb; b, ibs levers; c, nheirsprings; d, the keyhole and e theweb of the proper key.

The improved safety device eonsistas ofa ring s, standing nearly aroundthe keyhole d, bub eeeentric L0 be patzh of the proper key, as shown inFig. 2, in which the said pabh is indieated by the dot-and-dash line t.The ring s is fast 110 one end of a bar u, he opposite end of which isfast; to a rod Z. This lat- 1zer staands an a righ angle With the bar u,

tu rns in bearirigs in the side plates i i, and

Serial N0. 22,374. (N0 model.)

| projeets throngh the pla1ae z" and the (1001. m is an arm fast; by'oneend 011 the projecting ehd 0f the rod Z ab about a right angletherewi'nh.

n is a stud depending from an alarm 0 as far as he onner end 0f Ehe armm. This stand 'n is in operative conneetion with the alarmtrigger toreleas'e the sarne by being pressed upward, as indicated by- Ehe doted1ines in Fig. l.

Fig. 3 Shows the use of Ehe proper key whieh moves through its pahwithont its nose touehing the inner face 0f the ring s; bu'n a false key01 a pick-lock wnld engage with t1hat faee and roek the bar u, therebyturning the bar Z and the arm m 110 sound the alarn1 0.

I claim The cornbination with Ishe bolh 0f a loek 01 of a latch actuatedby a key, 0f a ring standing within the case 0f be said lock 01 latchand nearly surrounding the keyhole but1 eccentric 50 the path of Eheproper key; a 10d pivoted '00 tutn in bearings in ehe side plates ofalle said ease; a bar within the said case fast to the said ring andalso the said rod; an arm onoside nhe said case and fast; so Ehe saidr0d; an alarm likewise outside the said case and a stand conneeted wibhthe trigger of ohe said alarrn and in toneh with the free end 0f thesaid arm.

In testimony that I elaim '0he foregoing as my invention I have signedn1y name in presenee of tavvo subscribing witnesses.

' HANS MOLLENHAUER.

Wiunesses:

WOLDEMAR HAUPT, HENRY HASPER.

